#!/bin/shtest_description='handling of duplicate objects in incoming packfiles'
. ./test-lib.sh
. "$TEST_DIRECTORY"/lib-pack.sh
if! test_have_prereq SHA1
thenskip_all='not using SHA-1 for objects'
test_done
fi# The sha1s we have in our pack. It's important that these have the same# starting byte, so that they end up in the same fanout section of the index.# That lets us make sure we are exercising the binary search with both sets.LO_SHA1=e68fe8129b546b101aee9510c5328e7f21ca1d18
HI_SHA1=e69de29bb2d1d6434b8b29ae775ad8c2e48c5391
# And here's a "missing sha1" which will produce failed lookups. It must also# be in the same fanout section, and should be between the two (so that during# our binary search, we are sure to end up looking at one or the other of the# duplicate runs).MISSING_SHA1='e69d000000000000000000000000000000000000'# git will never intentionally create packfiles with# duplicate objects, so we have to construct them by hand.## $1 is the name of the packfile to create## $2 is the number of times to duplicate each object
create_pack (){
pack_header "$((2 * $2))">"$1"&&for i in $(test_seq 1"$2"); do
pack_obj $LO_SHA1&&
pack_obj $HI_SHA1done>>"$1"&&
pack_trailer "$1"}# double-check that create_pack actually works
test_expect_success 'pack with no duplicates''
create_pack no-dups.pack 1 &&
git index-pack --stdin <no-dups.pack
'
test_expect_success 'index-pack will allow duplicate objects by default''
clear_packs &&
create_pack dups.pack 100 &&
git index-pack --stdin <dups.pack
'
test_expect_success 'create batch-check test vectors''
cat >input <<-EOF &&
$LO_SHA1
$HI_SHA1
$MISSING_SHA1
EOF
cat >expect <<-EOF
$LO_SHA1 blob 2
$HI_SHA1 blob 0
$MISSING_SHA1 missing
EOF
'
test_expect_success 'lookup in duplicated pack''
git cat-file --batch-check <input >actual &&
test_cmp expect actual
'
test_expect_success 'index-pack can reject packs with duplicates''
clear_packs &&
create_pack dups.pack 2 &&
test_must_fail git index-pack --strict --stdin <dups.pack &&
test_expect_code 1 git cat-file -e $LO_SHA1
'
test_done